class Code:
    SUCCESS = 200  # 成功
    ERROR = -1  # 未知错误
    LOGIN_OUT = -2  # 登录失效
    LOGIN_ERROR = -3  # 用户名或密码不正确
    ADD_STUDENT_ERROR = -4  # 新增学生失败
    UPDATE_STUDENT_ERROR = -5  # 修改学生失败
    DELETE_STUDENT_ERROR = -6  # 删除学生失败
    PERMISSION_DENY = -10  # 权限不足
